All-round supramolecular zwitterionic hydrogel electrolytes enabling environmentally adaptive dendrite-free aqueous zinc ion capacitors

Fu, Qingjin; Hao, Sanwei; Zhang, Xinrui; Zhao, Haonan; Xu, Feng; Yang, Jun

doi:10.1039/d2ee03793a

Cited by 71 publications

(46 citation statements)

References 93 publications

(168 reference statements)

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“…As shown in Figure S13, when the ambient temperature is −20 °C, the tensile strength of the PSM/TF/Zn 2+ -40 wt % zwitterionic hydrogel increases, the maximum strain decreases, and the toughness increases, compared with that of the room temperature hydrogel. This may be due to the enhancement of noncovalent interactions at low temperatures and the increase of cohesion in hydrogels at lower temperatures, which have been confirmed in previous works. , Similarly, the adhesion strength of the PSM/TF/Zn 2+ -40 wt % zwitterionic hydrogel was tested by the building shear test at different substrates and different temperatures, which verified that the adhesion strength of all substrates increased below zero temperature (Figure f). These results further indicated that this zwitterionic hydrogel had potential applications as flexible wearable sensors in cold environments (Figure g).…”

Section: Resultssupporting

confidence: 85%

“…In recent years, inspired by human skin, flexible electronic sensors with stretchability, conductivity, flexibility, and haptic sensing capabilities have received more attention for their potential to transform human lifestyles in a variety of fields, such as electronic skin applications, human–computer interactions, personalized medical detection, and soft robotics. − The key issues for flexible electronic sensors are to improve the operational lifetime, expand the application conditions, and optimize the integration of electrical properties . However, conventional elastomers (for instance, polyurethane and rubber) used in electronic sensors have a much higher modulus of elasticity than human skin, which are prone to many problems in applications of poor compliance, mechanical mismatch, and foreign body reactions .…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional MXene Conductive Zwitterionic Hydrogel for Flexible Wearable Sensors and Arrays

Guo,

Mai,

Huang

et al. 2023

ACS Appl. Mater. Interfaces

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Conductive hydrogels have good prospects in the fields of flexible electronic devices and artificial intelligence due to their biocompatibility, durability, and functional diversity. However, the process of hydrogel polymerization is time-consuming and energy-consuming, and freezing at zero temperature is inevitable, which seriously hinders its applications and working life. Herein, zwitterionic conductive hydrogels with self-adhesive and antifreeze properties were prepared in one minute by introducing twodimensional (2D) MXene nanosheets into the autocatalytically enhanced system composed of tannic acid-modified cellulose nanofibers and zinc chloride. The system has strong environmental applicability (−60 to 40 °C), good stretchability (ductility ≈ 980%), durable adhesion (even after 30 days of exposure to air), and strong electrical conductivity (20 °C, 30 mS cm −1 ). By virtue of these advantages, the prepared zwitterionic hydrogels can be developed into flexible strain sensors to monitor large human movements and subtle physiological signals over a wide temperature range and to capture signals from handwriting and voice recognition. In addition, multiple flexible sensors can be assembled into a three-dimensional (3D) array, which can detect the magnitude and spatial distribution of strain or force. These results demonstrate that the prepared zwitterionic hydrogels have promising applications in the fields of medical monitoring and artificial intelligence.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Multifunctional MXene Conductive Zwitterionic Hydrogel for Flexible Wearable Sensors and Arrays

Guo,

Mai,

Huang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…To enable the practical application of flexible hydrogel-based sensors, the antifreezing and antidrying ability should be carefully taken into consideration. Typically, by fabricating the “ionic liquid-water” hybrid gels, the formation of ice crystals can be efficiently inhibited, , whereas ionogels made of ionic liquids (ILs) are not biocompatible, of high cost, or even toxic. − Gels fabricated using deep eutectic solvents (DES) are more economical, biocompatible, resistant to extreme temperatures, and less toxic than traditional hydrogels and ionic liquids . Gels of DESs were currently investigated in sensors, capacitors, and batteries .…”

Section: Introductionmentioning

confidence: 99%

“Deep Eutectic Solvent-in-Water” Hydrogels Enable High-Performance Flexible Strain Sensors for Electronic Skin with a Wide Operating Temperature Range

Wang

Xing

et al. 2023

ACS Sustainable Chem. Eng.

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Conductive hydrogels have become one of the hot topics in flexible strain sensors owing to excellent biocompatibility, attractive mechanical flexibilities, and conductive properties. However, the time-consuming preparation of hydrogels and their unsuitable properties limit their application in low-temperature environment and high temperatures. Here, a new class of “deep eutectic solvent-in-water” hydrogels (DIWHs) is reported for the first time through a one-step gelation process in situ without solvent displacement, fabricated by combining a hydrogel with deep eutectic solvent (DES). The DIWH is constructed using a dynamic oxidation and coordination system composed of sodium lignosulfonate (Ls) and Fe3+. The effect of DES and the optimal mass ratio of water and DES on the hydrogel properties was synthetically investigated. The addition of DES not only shortens the polymerization time to 8 s and enhances the mechanical properties of the hydrogel but also provides some unique properties. For example, the addition of DES gives the gels greater self-healing ability and antibacterial properties. When the mass ratio of water to DES was 1:3, excellent antifreezing and antidrying properties were imparted to the gel, and the elasticity of the hydrogel was maintained even at −80 °C or stored at 60 °C for 7 days. Furthermore, the hydrogel exhibited strong interfacial adhesion to natural and synthetic materials (up to 60 kPa on glass) due to the presence of Ls with a catechol structure. In conclusion, this work stimulates more interest in the sustainable and high-value utilization of DES and fully demonstrates the advantages of this new easy-to-prepare coacervation gel for sensing.

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“…Conductive hydrogels, soft and wet functional materials, have been increasingly investigated in flexible electronic devices, such as wearable mechanosensors, − adhesive electrodes, energy generation devices, , and energy storage systems. − Much effort has been made to improve the properties of conductive hydrogels to meet the requirements in practical applications. On the one hand, the mechanical properties and structures of hydrogels are improved by designing unique network structures or by special preparation technologies. − On the other hand, conductivity of hydrogels is achieved by introducing various conductive components, such as soluble salts, ionic liquids, carbon nanomaterials, metal nanomaterials, MXene, and liquid metals …”

Section: Introductionmentioning

confidence: 99%

Scalable Fabrication of All-Biopolymer-Derived Conductive Hydrogels for Flexible Mechanosensors and Zinc-Ion Hybrid Supercapacitors

Zheng

Zhou

Wei

et al. 2023

ACS Appl. Eng. Mater.

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Traditional synthetic hydrogels for flexible electronic devices are mostly derived from nonsustainable polymers, resulting in environmental pollution. Herein, scalable, moldable, and stretchable ionic hydrogels are synthesized utilizing two model biopolymers, κ-carrageenan (κ-CG) and amylopectin (Amy). In such hydrogels, physically cross-linked κ-CG networks work as a relatively rigid component to maintain the shape of hydrogels, Amy networks cross-linked by borate/cis-diol dynamic covalent bonds help to improve the stretchability, and ZnSO4 is introduced as an ionic conductive component. The hydrogels, denoted as κ-CG/Amy/Zn2+ hydrogels, exhibit acceptable stretchability (>100%) because of the special cross-linking structure and ionic conductivity (2.9 S·m–1) due to the existence of various ions. Flexible mechanosensors (resistive strain sensors and capacitive pressure sensors) are demonstrated utilizing κ-CG/Amy/Zn2+ hydrogels, and high gauge factors (0.76 for strain sensors and 0.77 kPa–1 for pressure sensors) are achieved. Interestingly, κ-CG/Amy/Zn2+ hydrogels also work as quasi-solid-state electrolytes in zinc-ion hybrid supercapacitors, which exhibit an initial specific capacity of 47.4 mAh·g–1 at a current density of 3 A·g–1 and stable charge/discharge ability in more than 42,000 cycles. The sustainable biopolymer hydrogels may provide promising eco-friendly materials for future wearable devices and energy storage systems.

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All-round supramolecular zwitterionic hydrogel electrolytes enabling environmentally adaptive dendrite-free aqueous zinc ion capacitors

Abstract: Aqueous zinc ion capacitors (ZICs) with hydrogel electrolytes (HEs), that afford the superiority of high sustainability, inherent safety, appealing energy/power densities, and extraordinary mechanics, have long been considered as an...

Cited by 71 publications

References 93 publications

Multifunctional MXene Conductive Zwitterionic Hydrogel for Flexible Wearable Sensors and Arrays

Multifunctional MXene Conductive Zwitterionic Hydrogel for Flexible Wearable Sensors and Arrays

“Deep Eutectic Solvent-in-Water” Hydrogels Enable High-Performance Flexible Strain Sensors for Electronic Skin with a Wide Operating Temperature Range

Scalable Fabrication of All-Biopolymer-Derived Conductive Hydrogels for Flexible Mechanosensors and Zinc-Ion Hybrid Supercapacitors

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